Radiator Outer Tank (In Tank Oil Cooler) Removal Note

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the height of the header tabs.
Insert the end of a medium tip screwdriver between the end of the header tab and the outer tank.
NOTE:
- Do not open more tabs than necessary for tank removal.
Fig 1: Identifying Header Tab Height
Courtesy of MAZDA MOTORS CORP.
Pivot the screwdriver to pry the tab away from the tank and repeat the procedure for each tab.
Remove the radiator outer tank and O-ring (gasket) from the core header when all of the tabs are opened.
NOTE:
- If any header tabs are missing from the core, replace the radiator.
Fig 2: Pivoting Screwdriver
Courtesy of MAZDA MOTORS CORP.
Inspect the gasket surface of the radiator core header to ensure it is clean and free of foreign material or damage.
Inspect the radiator outer tank for warping. If it is warped, replace radiator tank.